content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.*;
  
  import org.junit.*;
  
  public class WindowTest {
  
      @Test
      public void normal() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(2);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(3, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2);
          IxTestHelper.assertValues(list.get(1), 3, 4);
          IxTestHelper.assertValues(list.get(2), 5);
      }
  
      @Test
      public void normalSizeSkipSame() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(2, 2);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(3, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2);
          IxTestHelper.assertValues(list.get(1), 3, 4);
          IxTestHelper.assertValues(list.get(2), 5);
      }
  
      @Test
      public void normalOne() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(1);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(5, list.size());
          IxTestHelper.assertValues(list.get(0), 1);
          IxTestHelper.assertValues(list.get(1), 2);
          IxTestHelper.assertValues(list.get(2), 3);
          IxTestHelper.assertValues(list.get(3), 4);
          IxTestHelper.assertValues(list.get(4), 5);
      }
  
      @Test
      public void normalAll() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(5);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(1, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2, 3, 4, 5);
      }
  
      @Test
      public void normalMore() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(10);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(1, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2, 3, 4, 5);
      }
  
      @Test
      public void innerMovesParent() {
  
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(3);
  
          Iterator<Ix<Integer>> it0 = source.iterator();
  
          Ix<Integer> inner = it0.next();
  
          Iterator<Integer> it1 = inner.iterator();
  
          try {
              inner.iterator();
              Assert.fail("Should have thrown IllegalStateException");
          } catch (IllegalStateException ex) {
              Assert.assertEquals("This Window Ix iterable can be consumed only once.", ex.getMessage());
          }
          Assert.assertEquals(1, it1.next().intValue());
          Assert.assertEquals(2, it1.next().intValue());
          Assert.assertEquals(3, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
      }
  
      @Test
      public void normalSkip() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(2, 3);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(2, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2);
          IxTestHelper.assertValues(list.get(1), 4, 5);
      }
  
      @Test
      public void normalSkip2() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(1, 2);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(3, list.size());
          IxTestHelper.assertValues(list.get(0), 1);
          IxTestHelper.assertValues(list.get(1), 3);
          IxTestHelper.assertValues(list.get(2), 5);
      }
  
      @Test
      public void normalSkip3() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(1, 6);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(1, list.size());
          IxTestHelper.assertValues(list.get(0), 1);
      }
  
      @Test
      public void normalAllSkip() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(5, 10);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(1, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2, 3, 4, 5);
      }
  
      @Test
      public void normalMoreSkip() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(10, 15);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(1, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2, 3, 4, 5);
      }
  
      @Test
      public void justSkip() {
          Ix<Ix<Integer>> source = Ix.just(1).window(2, 3);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(1, list.size());
          IxTestHelper.assertValues(list.get(0), 1);
      }
  
      @Test
      public void emptySkip() {
          Ix<Ix<Integer>> source = Ix.<Integer>empty().window(2, 3);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(0, list.size());
      }
  
      @Test
      public void skipInnerMovesParent() {
  
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(2, 3);
  
          Iterator<Ix<Integer>> it0 = source.iterator();
  
          Ix<Integer> inner = it0.next();
  
          Iterator<Integer> it1 = inner.iterator();
  
          try {
              inner.iterator();
              Assert.fail("Should have thrown IllegalStateException");
          } catch (IllegalStateException ex) {
              Assert.assertEquals("This Window Ix iterable can be consumed only once.", ex.getMessage());
          }
          Assert.assertEquals(1, it1.next().intValue());
          Assert.assertEquals(2, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
          inner = it0.next();
          it1 = inner.iterator();
  
          Assert.assertEquals(4, it1.next().intValue());
          Assert.assertEquals(5, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
          Assert.assertFalse(it0.hasNext());
      }
  
      @Test
      public void normalOverlap() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(2, 1);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(5, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2);
          IxTestHelper.assertValues(list.get(1), 2, 3);
          IxTestHelper.assertValues(list.get(2), 3, 4);
          IxTestHelper.assertValues(list.get(3), 4, 5);
          IxTestHelper.assertValues(list.get(4), 5);
      }
  
      @Test
      public void normalOverlap2() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(3, 1);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(5, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2, 3);
          IxTestHelper.assertValues(list.get(1), 2, 3, 4);
          IxTestHelper.assertValues(list.get(2), 3, 4, 5);
          IxTestHelper.assertValues(list.get(3), 4, 5);
          IxTestHelper.assertValues(list.get(4), 5);
      }
  
      @Test
      public void normalOverlap3() {
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(3, 2);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(3, list.size());
          IxTestHelper.assertValues(list.get(0), 1, 2, 3);
          IxTestHelper.assertValues(list.get(1), 3, 4, 5);
          IxTestHelper.assertValues(list.get(2), 5);
      }
  
      @Test
      public void nullExact() {
          Ix<Ix<Integer>> source = Ix.<Integer>fromArray(null, null, null, null, null).window(2);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(3, list.size());
          IxTestHelper.assertValues(list.get(0), null, null);
          IxTestHelper.assertValues(list.get(1), null, null);
          IxTestHelper.assertValues(list.get(2), (Integer)null);
      }
  
      @Test
      public void nullExact2() {
          Ix<Ix<Integer>> source = Ix.<Integer>fromArray(null, null, null, null, null).window(6);
  
          Iterator<Integer> list = source.iterator().next().iterator();
  
          Assert.assertNull(list.next());
          Assert.assertNull(list.next());
          Assert.assertNull(list.next());
          Assert.assertNull(list.next());
          Assert.assertNull(list.next());
          Assert.assertFalse(list.hasNext());
      }
  
      @Test
      public void nullSkip() {
          Ix<Ix<Integer>> source = Ix.<Integer>fromArray(null, null, null, null, null).window(2, 3);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(2, list.size());
          IxTestHelper.assertValues(list.get(0), null, null);
          IxTestHelper.assertValues(list.get(1), null, null);
      }
  
      @Test
      public void nullOverlap() {
          Ix<Ix<Integer>> source = Ix.<Integer>fromArray(null, null, null, null, null).window(2, 1);
  
          List<Ix<Integer>> list = source.collectToList().first();
  
          Assert.assertEquals(5, list.size());
          IxTestHelper.assertValues(list.get(0), null, null);
          IxTestHelper.assertValues(list.get(1), null, null);
          IxTestHelper.assertValues(list.get(2), null, null);
          IxTestHelper.assertValues(list.get(3), null, null);
          IxTestHelper.assertValues(list.get(4), (Integer)null);
      }
  
      @Test
      public void overlapInnerMovesParent() {
  
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(2, 1);
  
          Iterator<Ix<Integer>> it0 = source.iterator();
  
          Ix<Integer> inner = it0.next();
  
          Iterator<Integer> it1 = inner.iterator();
  
          try {
              inner.iterator();
              Assert.fail("Should have thrown IllegalStateException");
          } catch (IllegalStateException ex) {
              Assert.assertEquals("This Window Ix iterable can be consumed only once.", ex.getMessage());
          }
          Assert.assertEquals(1, it1.next().intValue());
          Assert.assertEquals(2, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
          inner = it0.next();
          it1 = inner.iterator();
  
          Assert.assertEquals(2, it1.next().intValue());
          Assert.assertEquals(3, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
          Assert.assertTrue(it0.hasNext());
      }
  
      @Test
      public void overlapInnerMovesParent2() {
  
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(3, 2);
  
          Iterator<Ix<Integer>> it0 = source.iterator();
  
          Ix<Integer> inner = it0.next();
  
          Iterator<Integer> it1 = inner.iterator();
  
          try {
              inner.iterator();
              Assert.fail("Should have thrown IllegalStateException");
          } catch (IllegalStateException ex) {
              Assert.assertEquals("This Window Ix iterable can be consumed only once.", ex.getMessage());
          }
          Assert.assertEquals(1, it1.next().intValue());
          Assert.assertEquals(2, it1.next().intValue());
          Assert.assertEquals(3, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
          inner = it0.next();
          it1 = inner.iterator();
  
          Assert.assertEquals(3, it1.next().intValue());
          Assert.assertEquals(4, it1.next().intValue());
          Assert.assertEquals(5, it1.next().intValue());
          Assert.assertFalse(it1.hasNext());
  
          Assert.assertTrue(it0.hasNext());
      }
  
      @Test
      public void overlapParentMoved() {
  
          Ix<Ix<Integer>> source = Ix.range(1, 5).window(4, 3);
  
          Iterator<Ix<Integer>> it0 = source.iterator();
  
          Ix<Integer> inner1 = it0.next();
          Ix<Integer> inner2 = it0.next();
  
          Assert.assertFalse(it0.hasNext());
  
          IxTestHelper.assertValues(inner1, 1, 2, 3, 4);
          IxTestHelper.assertValues(inner2, 4, 5);
      }
  
  }
  